I HAVE A RCA RADIO MODEL 61-8. IN THE PARTS DESCRIPTION LIST IT LISTS A "COMBINATION CAPACITOR". IT HAS A COMMON GROUND WITH THE LEAD GOING TO THE CHASSIS AND THEN A 30 MFD AND A 50 MFD LEAD COMING OUT OF IT GOING TO THE TUBES. TO REPLACE THESE PROPERLY WOULD I BE ABLE TO GET 2 SEPERATE CAPS WITH THE CORRECT VALUES AND TIE THEIR GROUNDS TOGETHER, THEN TAKE THEM TO THE GROUND THAT IS IS CURRENTLY SOLDERED TO?

Simply put, Yes.